Fan with soft start function

Abstract

A bathroom ventilator fan with the soft-start function includes an impeller and a motor. The motor is coupled to the impeller for driving the impeller to rotate. The motor has a control module for driving and controlling the rotation speed of the motor according to a soft-start signal. The soft-start signal includes a soft-start section and a target-driving section. The control module slowly increases the rotation speed of the motor from the soft-start section to reach the target-driving section.

1 . A fan with a soft-start function, comprising:
 an impeller; and   a motor coupled to the impeller for driving the impeller to rotate, wherein the motor comprises a control module for driving and controlling a rotation speed of the motor according to a soft-start signal, the soft-start signal comprises a soft-start section and a target-driving section, and the control module slowly increases the rotation speed of the motor from the soft-start section to reach the target-driving section.   
   
   
       2 . The fan according to  claim 1 , wherein the soft-start signal further comprises an initial rotation-speed section, and the control module keeps the rotation speed of the motor at an initial rotation speed according to a rotation speed of the initial rotation-speed section before the rotation speed of the motor is increased. 
   
   
       3 . The fan according to  claim 1 , wherein a power source is provided to apply power to the motor. 
   
   
       4 . The fan according to  claim 3 , wherein the power source is a DC power source or an AC power source. 
   
   
       5 . The fan according to  claim 4 , wherein the AC power source is converted into a DC power source through an AC/DC converter. 
   
   
       6 . The fan according to  claim 5 , wherein the AC/DC converter comprises a rectification module. 
   
   
       7 . The fan according to  claim 6 , wherein the rectification module is a rectification circuit. 
   
   
       8 . The fan according to  claim 6 , wherein the AC/DC converter further comprises a voltage-drop module coupled to the rectification module. 
   
   
       9 . The fan according to  claim 8 , wherein the voltage-drop module is a voltage-drop circuit. 
   
   
       10 . The fan according to  claim 4 , wherein the DC power source is decreased to a work voltage of the motor through a voltage-drop module. 
   
   
       11 . The fan according to  claim 10 , wherein the voltage-drop module is a voltage-drop circuit. 
   
   
       12 . The fan according to  claim 1 , wherein the soft-start signal is generated by the control module. 
   
   
       13 . The fan according to  claim 12 , wherein the control module adjusts a slope of the soft-start section of the soft-start signal. 
   
   
       14 . The fan according to  claim 1 , wherein the control module is a micro control unit (MCU). 
   
   
       15 . The fan according to  claim 1 , wherein the soft-start signal is generated by an external device and then transmitted to the control module. 
   
   
       16 . The fan according to  claim 15 , wherein the external device is a soft-start circuit. 
   
   
       17 . The fan according to  claim 1 , wherein the soft-start section is connected to the target-driving section smoothly. 
   
   
       18 . The fan according to  claim 1 , wherein the soft-start section is a linear curve or a second-degree curve. 
   
   
       19 . The fan according to  claim 1 , wherein a noise raising rate of the fan according to the soft-start section is not larger than 2 dB per second. 
   
   
       20 . The fan according to  claim 1 , which is a DC fan, an AC fan, an electrically commutated fan (EC fan), or a bathroom ventilator fan.